A kind of production method of potassium nitrate

Abstract

The invention discloses a potassium nitrate production method, comprising the following steps: Step (1): magnesium oxide, potassium chloride and nitric acid react; Step (2): a reaction solution obtained in the Step (1) undergoes solid-liquid separation to obtain a filtrate; Step (3): a cosolvent is mixed into the filtrate obtained in the Step (2); Step (4): a crystallization feed liquid obtained in the Step (3) undergoes solid-liquid separation so as to obtain potassium nitrate. The method has the following advantages: the raw materials are easily available; the cost is low; the technology isgreen and environmentally-friendly; and the cosolvent can be repeatedly recovered for indiscriminate application. In comparison with a traditional double decomposition technology, the production method of the invention has the following beneficial effects: product purity is higher; yield is higher; the application range of the by-product magnesium chloride is wider; and the risk brought from the use of ammonium nitrate to production and inconveniences of raw material transportation are also avoided.

Description

Technical field

[0001] The invention relates to the technical field of inorganic chemical engineering, in particular to a method for producing high-purity potassium nitrate Background technique

[0002] Potassium Nitrate (KNO 3 ) Also known as saltpeter and soil nitrate, it is an important inorganic chemical product and a high-quality compound fertilizer of chlorine-free nitrogen and potassium. As an agricultural potash fertilizer, potassium nitrate is much better than potassium chloride. It has the effect of significantly improving crop quality and increasing production and income. Potassium nitrate for non-fertilizer purposes is a raw material for making black gunpowder and is also used in flames to produce purple sparks. The pharmaceutical industry can be used to produce penicillin potassium salt and rifampin. Edible potassium nitrate is used as a coloring agent and antiseptic additive in the food industry. It can also be used as a glass fining agent and in the manufacture...

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